What kind of pressure is used with absolute pressure transmitters (measuring positive or negative pressure)?
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Are absolute pressure transmitters suitable for positive side pressure or negative side pressure? Are absolute pressure transmitters suitable for measuring both positive and negative pressures? For example: Should an absolute pressure transmitter be used on the pipeline at the fan inlet (negative pressure) or on the pipeline at the fan outlet (positive pressure)?
Too low a negative pressure (-80 Kpa) is measured using an absolute pressure gauge, while slightly higher negative pressure (-20 Kpa) is measured with a differential pressure transmitter. Is that correct? Thank you
An absolute pressure transmitter cannot be used to measure positive or negative pressure; it is only suitable for measuring absolute pressure.
If an absolute pressure transmitter can only measure absolute pressure and not negative pressure, then what instrument should be used to measure negative pressure? Second question: Can the negative pressure reach -150 KPa? Negative pressure is referenced to the absolute pressure zero point (-100 KPa)
In fact, the so-called negative pressure is just a way of expressing pressure. To measure negative pressure, an absolute pressure transmitter must be used. The gauge pressure transmitter can measure negative pressure, positive pressure, as well as alternating positive and negative pressures!
Senior, can it be understood this way! Gauge pressure is a measure of absolute pressure; is it equivalent to vacuum? Negative pressure refers to a range from vacuum to standard atmospheric pressure, while positive pressure is greater than standard atmospheric pressure. Also, stop insulting people!
Gauge pressure is referenced to an absolute zero point, and atmospheric pressure must also be added. Gauge pressure is referenced to atmospheric pressure
Looking at your question, it seems like you don’t need to choose Absolute Pressure after all. Gauge pressure is sufficient; this negative pressure isn’t high
Either a differential pressure gauge or a gauge pressure gauge will work. As for the use of gauge pressure meters, it depends on the process objectives of the object being measured; see post 6 below. http://bbs.hcbbs.com/thread-1418857-1-1.html
Its display also differs from that of negative pressure; the gauge pressure range is 0-100 KPA, and when it reads 0, it is close to absolute vacuum!
To measure the negative pressure under ambient conditions, it is best to use a gauge pressure meter, as this reduces the risk of damaging the formwork； It works whenever the gauge pressure is positive.